Improvement in projectiles for ordnance



B. ARRICK. Projec tile for Ordnance.

Patented Feb. 23,1875

INVENTOR WITNESSES MQAM WW ATTORN EY CLIFFORD ARRIOK, OF WASHINGTON,DISTRICT OF COLUMBIA.

IMPROVEMENT EN PRQJECTILES FOR ORDNANCE.

Specification forming part of Letters Patent No. H60,7R, dated February23,1875; application filed January 13, 1875.

To all whom it may concern:

Be it known that I, CLIFFORD Annrox, of Washington, District ofColumbia, have invented a Projectile, of which the following is aspecification: y

. My invention consists in an improvement upon what is popularly knownamong ordnance experts as the Eureka Projectile, secured to me byLetters Patent of the United States No. 47,078, March 28, 1865, and hasfor its. object a more complete utilization of that device.

The soft-metal shoe, which distinguishes the Eureka Projectile fromothers of the same class, accomplishes its function by an arbitrarycompound expansion, whereby, under the immediate action of the gunpowdergases and the superior m's inertia of theiron body of the projectile,the requisite adjustment by a radial suppression of windage, and thenecessary impression of the grooved bore upon a suitable substance, isaccurately and simultaneously guaranteed.

Figure 2 of the drawings exhibits substantially my original arrangementfor accomplishin g this result, wherein f is a sectional view of theiron body of the projectile, and b, d, and c of its expanding parts. Themethod of securing the latter to the former, as shown in my said patent,was by a clinch but the wroughtiron screw-bolt g is believed to benecessary to the safe operation of my improvement.

Different methods of preventing any axial movement of the sabotindependently of the iron body of the projectile, and also of relievingthe air-chamber a, have been suggested;

but Fig. 1 of the drawings represents the plan heretofore adopted inconnection with the Eureka sabot, wherein one or more rectangulargrooves, m, corresponding blocks 70, and air-passages s, irregular intheir dimensions, and for the mere purpose of facilitating its escape,have been used; but my improvement relates to the means shown in Fig. 3,wherein one or more tapering grooves, h, tapering blocks 0, andair-passages s s are to be substituted, and for the further purpose ofcontrolling and regulating such escape, and if need be, in some measureat least, finally arresting the same, as hereinafter more particularlyset forth.

Manifestly, the displacement of the air from the chamber a must precedeits final collapse, and that, by inereasin g or diminishing the means ofescape, its resistance thereto may be more or less intensified. It isequally apparent that the block 0 may be so constructed that, as suchcollapse progresses, the tapering passages s s will be rapidlydiminished in dimension, or so that, at any desired stage thereof, thesame may be entirely suppressed. In this wise the movement of the Eurekasabot will be met by a constantly increasing resistance, and anairchamber of limited capacity between the brass and iron be preservedto the end 5 and so, if otherwise expedient, any complete conjunctionthereof be wholly prevented.

It is suggested also that the inside of the plate b, as well as the baseof the iron body of the projectile, either at the cast or in the lathe,may be provided with annular grooves, corrugations, or other angularsurfaces, whereby, under the force of the discharge, and as the formeris brought to a bearing upon the latter, there may be establishedbetween the two a great number and variety of smaller air-chambers, fromwhich thereafter it will be impossible to expel the air, and whereby anycontinuous conjunction of the brass and iron will, in like manner, beprevented.

It is also proposed, in aid of my improve ment, to extend the part bmore nearly to the center of the iron body f than heretofore, as shownin Fig, 2, and hence to extend the air-chamber a, and for the purpose ofgiving greater scope and efficiency thereto as an elastic cushion also,to increase somewhat the expan-' sibility of the lip 11 by a slightchange of the radiuses on which it is intended to move, and so as toguarantee, under ordinary and non-exceptional intensities of pressure, aperfect impression of the rifled bore without closing entirely the spacee, and so that there may be maintained at that point an increasingresistance to compression and a remaining space.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

The projectile provided with a tapering groove, h, and sabot or cup I),provided with tapering block 0, when combined and' adapted for operationas shown and described.

CLIFFORD ARRIOK.

Witnesses O. H. ARRIGK, W. M. TEMPLETON.

